<!DOCTYPE html>
<html>
    <head>
        <title>This is the title</title>
    </head>
    <body>
        <div style="display: flex; align-items: center;"><input id="range1" type="range" />&nbsp;<span id="range_value"></span></div>
        <p id="p1">paragraph</p>
        <button id="fs_button">Toggle Fullscreen</button>
        <button id="close_button">Close</button>
        <div id="r" style="background:red; width: 100px; height: 100px;"></div>
        <div id="g" style="background:green; width: 100px; height: 100px;"></div>
        <div id="b" style="background:blue; width: 100px; height: 100px;"></div>
    </body>
</html>